3 * The Regents of the University of Michigan
6 * Permission is granted to use, copy, create derivative works
7 * and redistribute this software and such derivative works
8 * for any purpose, so long as the name of The University of
9 * Michigan is not used in any advertising or publicity
10 * pertaining to the use of distribution of this software
11 * without specific, written prior authorization. If the
12 * above copyright notice or any other identification of the
13 * University of Michigan is included in any copy of any
14 * portion of this software, then the disclaimer below must
17 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
18 * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
19 * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
20 * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
21 * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
23 * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
24 * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
25 * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
26 * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
27 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
33 #endif /* HAVE_CONFIG_H */
35 #ifdef HAVE_LUCID_CONTEXT_SUPPORT
38 * Newer versions of MIT and Heimdal have lucid context support.
39 * We can use common code if it is supported.
46 #include <gssapi/gssapi_krb5.h>
54 typedef uint64_t OM_uint64;
58 write_lucid_keyblock(char **p, char *end, gss_krb5_lucid_key_t *key)
62 if (WRITE_BYTES(p, end, key->type)) return -1;
63 tmp.length = key->length;
64 tmp.value = key->data;
65 if (write_buffer(p, end, &tmp)) return -1;
70 prepare_krb5_rfc1964_buffer(gss_krb5_lucid_context_v1_t *lctx,
71 gss_buffer_desc *buf, int32_t *endtime)
73 #define FAKESEED_SIZE 16
75 static int constant_zero = 0;
76 unsigned char fakeseed[FAKESEED_SIZE];
77 uint32_t word_send_seq;
78 gss_krb5_lucid_key_t enc_key;
81 gss_buffer_desc fakeoid;
84 * The new Kerberos interface to get the gss context
85 * does not include the seed or seed_init fields
86 * because we never really use them. But for now,
87 * send down a fake buffer so we can use the same
88 * interface to the kernel.
90 memset(&enc_key, 0, sizeof(enc_key));
91 memset(&fakeoid, 0, sizeof(fakeoid));
92 memset(fakeseed, 0, FAKESEED_SIZE);
94 if (!(buf->value = calloc(1, MAX_CTX_LEN)))
97 end = buf->value + MAX_CTX_LEN;
99 if (WRITE_BYTES(&p, end, lctx->initiate)) goto out_err;
101 /* seed_init and seed not used by kernel anyway */
102 if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
103 if (write_bytes(&p, end, &fakeseed, FAKESEED_SIZE)) goto out_err;
105 if (WRITE_BYTES(&p, end, lctx->rfc1964_kd.sign_alg)) goto out_err;
106 if (WRITE_BYTES(&p, end, lctx->rfc1964_kd.seal_alg)) goto out_err;
107 if (WRITE_BYTES(&p, end, lctx->endtime)) goto out_err;
109 *endtime = lctx->endtime;
110 word_send_seq = lctx->send_seq; /* XXX send_seq is 64-bit */
111 if (WRITE_BYTES(&p, end, word_send_seq)) goto out_err;
112 if (write_oid(&p, end, &krb5oid)) goto out_err;
116 * The kernel gss code expects des-cbc-raw for all flavors of des.
117 * The keytype from MIT has this type, but Heimdal does not.
118 * Force the Heimdal keytype to 4 (des-cbc-raw).
119 * Note that the rfc1964 version only supports DES enctypes.
121 if (lctx->rfc1964_kd.ctx_key.type != 4) {
122 printerr(1, "prepare_krb5_rfc1964_buffer: "
123 "overriding heimdal keytype (%d => %d)\n",
124 lctx->rfc1964_kd.ctx_key.type, 4);
125 lctx->rfc1964_kd.ctx_key.type = 4;
128 printerr(2, "prepare_krb5_rfc1964_buffer: serializing keys with "
129 "enctype %d and length %d\n",
130 lctx->rfc1964_kd.ctx_key.type,
131 lctx->rfc1964_kd.ctx_key.length);
133 /* derive the encryption key and copy it into buffer */
134 enc_key.type = lctx->rfc1964_kd.ctx_key.type;
135 enc_key.length = lctx->rfc1964_kd.ctx_key.length;
136 if ((enc_key.data = calloc(1, enc_key.length)) == NULL)
138 skd = (char *) lctx->rfc1964_kd.ctx_key.data;
139 dkd = (char *) enc_key.data;
140 for (i = 0; i < enc_key.length; i++)
141 dkd[i] = skd[i] ^ 0xf0;
142 if (write_lucid_keyblock(&p, end, &enc_key)) {
148 if (write_lucid_keyblock(&p, end, &lctx->rfc1964_kd.ctx_key))
151 buf->length = p - (char *)buf->value;
154 printerr(0, "ERROR: failed serializing krb5 context for kernel\n");
155 if (buf->value) free(buf->value);
157 if (enc_key.data) free(enc_key.data);
162 prepare_krb5_rfc_cfx_buffer(gss_krb5_lucid_context_v1_t *lctx,
163 gss_buffer_desc *buf, int32_t *endtime)
165 printerr(0, "ERROR: prepare_krb5_rfc_cfx_buffer: not implemented\n");
171 serialize_krb5_ctx(gss_ctx_id_t ctx, gss_buffer_desc *buf, int32_t *endtime)
173 OM_uint32 maj_stat, min_stat;
174 void *return_ctx = 0;
176 gss_krb5_lucid_context_v1_t *lctx = 0;
179 printerr(2, "DEBUG: serialize_krb5_ctx: lucid version!\n");
180 maj_stat = gss_export_lucid_sec_context(&min_stat, &ctx,
182 if (maj_stat != GSS_S_COMPLETE) {
183 pgsserr("gss_export_lucid_sec_context",
184 maj_stat, min_stat, &krb5oid);
188 /* Check the version returned, we only support v1 right now */
189 vers = ((gss_krb5_lucid_context_version_t *)return_ctx)->version;
192 lctx = (gss_krb5_lucid_context_v1_t *) return_ctx;
195 printerr(0, "ERROR: unsupported lucid sec context version %d\n",
201 /* Now lctx points to a lucid context that we can send down to kernel */
202 if (lctx->protocol == 0)
203 retcode = prepare_krb5_rfc1964_buffer(lctx, buf, endtime);
205 retcode = prepare_krb5_rfc_cfx_buffer(lctx, buf, endtime);
207 maj_stat = gss_free_lucid_sec_context(&min_stat, ctx, return_ctx);
208 if (maj_stat != GSS_S_COMPLETE) {
209 pgsserr("gss_export_lucid_sec_context",
210 maj_stat, min_stat, &krb5oid);
211 printerr(0, "WARN: failed to free lucid sec context\n");
215 printerr(1, "serialize_krb5_ctx: prepare_krb5_*_buffer "
216 "failed (retcode = %d)\n", retcode);
223 printerr(0, "ERROR: failed serializing krb5 context for kernel\n");
226 #endif /* HAVE_LUCID_CONTEXT_SUPPORT */